docs: def emit(self, message):
          """
          emit to database
          """
          # handle vaping data that arrives in a list
          if isinstance(message.get("data"), list):
              for row in message.get("data"):
  
  
                  # format filename from data
                  filename = self.format_filename(message, row)
  
                  # create database file if it does not exist yet
                  if not os.path.exists(filename):
                      self.create(filename)
  
                  # update database
                  self.log.debug("storing time:%d, %s:%.5f in %s" % (
                      message.get("ts"), self.field, row.get(self.field), filename))
                  self.update(filename, message.get("ts"), row.get(self.field))